Dua Zikr Hisnul Muslim is a free Islamic app developed by Greentech Apps Foundation for Android devices. This app is designed to help Muslims practice their daily supplications and Zikr. It contains a total of 326 Duas from the Quran and Sunnah, which are divided into 20 categories for easy navigation. The app is based on the popular Hisnul Muslim book by Sheikh Sa'id Ibn Wahf Al-Qahtaani.

The app has a user-friendly interface and offers features such as Favorites, Font Size Adjustment, Share Option, Translation and Transliteration of each dua, Audio files sharing, Pinch Zoom, Daily Notification, and Search with highlights, copy, and share functions. The app is completely ad-free.

The Duas and Zikr topics in the app include daily day-to-day activities, from day to night, such as waking up, wearing and undressing, entering and leaving the toilet, performing ablution and prayer, going to the mosque, seeking guidance in making a decision, morning and evening Azkar & Dhikr, and more. This app is an excellent resource for Muslims who want to stay connected to their faith and practice their daily supplications.